Example 7.35: Propensity score matching

May 3, 2010

(This article was first published on SAS and R, and kindly contributed to R-bloggers)

As discussed in example 7.34, it’s sometimes preferable to match on propensity scores, rather than adjust for them as a covariate.SASWe use a suite of macros written by Jon Kosanke and Erik Bergstralh at the Mayo Clinic. The dist macro calculates the pairwise distances between observations, while the vmatch macro makes matches based on the distances, finding the closest set of matches while

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